Not everyone has the time to be outside. In the summer, I am on the patio for a bit every day. Apparently, that is not enough. Then again, sometimes, by the time I get home, the sun is about gone or gone. If the sun is still out, it is very strong and we sit at the table under the umbrella. I work in an inside office with no window. It's just not something you think about until there's a problem. I am feeling better, but I have also switched jobs and have less stress. I think that is more key for me.